Semiclassical universe from first principles

Causal Dynamical Triangulations in four dimensions provide a background-independent definition of the sum over space-time geometries in nonperturbative quantum gravity. We show that the macroscopic four-dimensional world which emerges in the Euclidean sector of this theory is a bounce which satisfies a semiclassical equation. After integrating out all degrees of freedom except for a global scale factor, we obtain the ground state wave function of the universe as a function of this scale factor.

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15 pages, 4 figures Report-no: SPIN-2004/22, ITP-UU-04/40, TPJU-19/2004

quantum gravity: nonperturbative
semiclassical
triangulation
causality
ground state: wave function
minisuperspace
numerical calculations: Monte Carlo

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